US3192890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuse for fire alarms
Assignee: Interstate Engineering Corp
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Filing: 1963-07-30
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Granted: 1965-07-06
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Expires: 1983-07-30
Abstract
No abstract record available.
Inventors
- 👤 Randolph J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:20
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A FIRE ALARM, A HOUSING, A SPRING-BIASED CONTROL LATCH EXTENDING OUTWARDLY FROM THE HOUSING AND MOVABLE OUTWARDLY RELATIVE THERETO, A PAIR OF SPACED FUSE ELEMENTS SUPPORTING POSTS CARRIED BY AND EXTENDING OUTWARDLY FROM SAID HOUSING ADJACENT SAID CONTROL LATCH AND HAVING ENLARGEMENTS ON THEIR OUTER ENDS, A FUSE ELEMENT HAVING A THERMALLY RELEASABLE PORTION ENGAGEABLE WITH SAID CONTROL LATCH TO HOLD IT AGAINST THE BIAS OF ITS SPRING, SAID FUSE ELEMENT HAVING SPACED KEYHOLE APERTURE TO ACCOMMODATE SAID SUPPORTING POSTS, EACH APERTURE HAVING A PORTION LARGE THAN THE ENLARGEMENT ON ITS RESPECTIVE POST, AND A PORTION SMALLER THAN THE ENLARGEMENT TO PERMIT LOCKING OF THE FUSE ELEMENT ON THE POSTS UNDER THE PRESSURE OF SAID SPING-BIASED CONTROL LATCH.
Claim 2
Dependent Claim
119 words
IN A FIRE ALARM, A HOUSING, A SPRING-BIASED CONTROL LATCH EXTENDING OUTWARDLY FROM THE HOUSING AND MOVABLE OUTWARDLY RELATIVE THERETO, A PAIR OF SPACED FUSE ELEMENTS SUPPORTING POSTS CARRIED BY AND EXTENDING OUTWARDLY FROM SAID HOUSING ADJACENT SAID CONTROL LATCH AND HAVING ENLARGEMENTS ON THEIR OUTER ENDS, A FUSE ELEMENT HAVING A THERMALLY RELEASABLE PORTION ENGAGEABLE WITH SAID CONTROL LATCH TO HOLD IT AGAINST THE BIAS OF ITS SPRING, SAID FUSE ELEMENT HAVING SPACED KEYHOLE APERTURE TO ACCOMMODATE SAID SUPPORTING POSTS, EACH APERTURE HAVING A PORTION LARGE THAN THE ENLARGEMENT ON ITS RESPECTIVE POST, AND A PORTION SMALLER THAN THE ENLARGEMENT TO PERMIT LOCKING OF THE FUSE ELEMENT ON THE POSTS UNDER THE PRESSURE OF SAID SPING-BIASED CONTROL LATCH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |